Area of irregular shapes?

In part i, the independent variable, the one that is intentionally manipulated, in part ii, the independent variable changes the dependent variable, the one you measure the response in, is the same for parts i and ii. for both parts of the lab, the dependent variable

Asequence is defined recursively using the formula f(n + 1) =f(n) - 5. which sequence could be

Check all that apply. f is a function. f is a one-to-one function. c is a function. c is a one-to-one function.